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A new method GetPort(...) for SerialPortManager Mojo interface is
added. The argument list for SerialPort::Open(...) method has been
changed and the related code has been adjusted accordingly.

BUG=908833

Change-Id: Iba156b1abb0e636ee623cd3de6eae6d0773722ff
Reviewed-on: https://chromium-review.googlesource.com/c/1369711Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Donna Wu <donna.wu@intel.com>
Cr-Commit-Position: refs/heads/master@{#615905}